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Theorem pm2.64 713
Description: Theorem *2.64 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.64

Proof of Theorem pm2.64
StepHypRef Expression
1 ax-1 5 . . 3
2 orel2 644 . . 3
31, 2jaoi 635 . 2
43com12 27 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wo 628
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in2 545  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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